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Valve Shim Calculator for the CRF250R and CRF250X

 

Honda CRF Valve Shim Calculator

Honda CRF Head and Valve Services   OEM Parts - Honda - Yamaha - Kawasaki - Suzuki

Looking to shim your Honda CRF250R/CRF250X valves to their correct tolerances? Use this valve shim calculator to make the job easy. It's set up with shim specs for the CRF250R and CRF250X but you can change those and use this calculator for the Honda CRF450R and CRF450X as well. At the bottom it has a link to the Hot Cams Shim Kit.

Honda CRF250R - CRF250X Valve Shim Calculator

Inches to Millimeter Conversion:

mm ->
in. ->

Intake Valve Shim Calculator

Spec. Valve Clearance mm (NOTE: Verify Valve Clearance in Service Manual)
Current Valve Clearance mm
Current Shim Thickness
mm

mm

Exhaust Valve Shim Calculator

Spec. Valve Clearance mm (NOTE: Verify Valve Clearance in Service Manual)
Current Valve Clearance mm
Current Shim Thickness
mm

mm

NOTE:

  • Make sure of the correct shim thickness by measuring the shim by micrometer.
  • Reface the valve seat if carbon deposit result in a calculated dimension of over 3.000 mm.
  • 73 different thickness shims are available from the thinnest 1.200 mm thickness shim to the thickness 3.000 mm thickness shim in intervals of 0.025mm.

NEED SHIMS? Below are the Honda part number for shims. You could also purchase the Hot Cams Shim kit listed in our catalog or just click here. You can also purchase individual shims from our OEM parts website at www.yeltrik.com.

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